Chain grate



Patented Apr. 20, 1926.

UNITED STATES PATENT OFFICE.

REN BRENGT, OF PARIS, FRANCE, ASSIGNOR T0 THE BABGOCK & WILCOX COMPANY, 0F BAYONNE, NEW JERSEY, A CORPORATION 0F NEVI JERSEY.

CHAIN CRATE.

Application filed March 21, 1921. i Serial No. 453,869,

.To all iti/wm, t may 00a/Germ.

Be it known that I, REN BRENOT, a citizen of the Republic of France, residing at Paris, 28 Rue Eugene Carriere, France, have invented certain new and useful Improvements in Chain Gratos, of which the following is a specification.

lt has heretofore been proposed in chaingrate stokers with natural or forced draft, to use an arrangement for regulating the air supply in which the air is supplied to airtight pressure chambers between the upper and lower runs of the grate, and is distributed thence in the various compartments, being allowed to escape through openings in an aperture plate or series of plates, over which the upper run of the grate travels.

ln accordance with one feature of the present invention there are provided a plurality of independent pressure air-chambers each fitted with dampers by which the pressure and quantity of air supplied to differ-v ent portions of the grate may be regulated. According to another feature of the invention these pressure air chambers are provided at their lower ends with hinged :(iaps y which permit of the removal of clinker and y the like and which may be vused for working under combined forced and natural draught.V

The invention is illustrated in the occompanying drawings in which the single figure is a longitudinal section through af chain grate embodying my invention and associated parts. In the drawing o denotes the independent pressure air chambers, three being shown. The air is led through a pipe and enters each of the chambers or compartments being controlled by a damper r. The air entering each compartment passes thence across the openings 0 in the plate or series of plates B over which the upper run of the ters Patent of the United States is grato Gr travels. As each compartment is equipped with a damper, the pressure in one may be varied without varying the pressure in the others. Likewise, the quantity of air can be regulate-,d` according to the state of the combustion at the different parts of the grate corresponding to each of the compartments.

Particles of coal andV small portions of clinker which pass through the upper portion of the chain grate and collect in the compartments, can be cleared by way of each compartment by means of a hinged flap V verse shafts 15.

nism comprising two or more cams 14 en-- gaging each flap valve and secured to trans- One end' of `each shaft is provided with a iever 16, connected by a link 17 to a manually operated lever' 18, each of whch normally stands in the position 18, the severa-l levers being in alinement in this position in thefigure. Each lever 18 is. provided with a pawl 21 engaging the teeth 22 of a segment 23. ln the figure, one of the levers 18 is in the position 18', this lever controlling the left-hand iiap valve V, which is open in this position of its lever 18. pawls Q1 serve to hold the levers 18 in this left-hand or normal position, the raising of a pawl 21 permitting the corresponding lever 18 to turn clockwise into the position 18 t0- the drawings, in order to reduce the size of the doors or flaps at the bottom of the com'- partments, and for alsoredueing the draft pressure against the same. Such' reduction in size is particularly desirable where forced draft pressuure is used which is considerable upon the surface of the door.

That I claim and desire to secure by Let- In combination, a chain grate stoker, a plurality of compartments between the upper and lower runs of the grate and extending substantially across the entire grate, means for supplying` air to saidk compartments, said compartments being provided with downwardly movable valves covering substantially the entire bottoms of said compartments for the discharge of dustl and the like, and means for Voperating said valves.

BnENor REN.

The I 

